We also have an 89 wagon in our family, as well as, other Volvos. I often compare them when having problems.

Here is what I have learnt about the 89 240's. This board is the only place that I have ever read about the 89 cpu problem. I have spoken to a Robert Bosch Corp.(the cpu mfr.) mechanic/tech, Volvo dealers, Volvo salvage yard dealers, other 89 owners, IPD, FCP, and many others about this so called problem with the 89. Here is what I was told. 1. Any car, Volvo or non-Volvo can have a cpu problem, and it almost invariably manifests itself immediately, just like a desktop pc - remember they have no moving parts. 2. No one I spoke to knows of any particular problem with the 89 Volvo than any other car. 3. In the end, meaning the final end, when the problem is known and the repair successful, it is usually discovered that it was not the cpu at all. I had this recent conversation with Ken @ IPD and he said those computers are extremely reliable and almost never have any problem, that's why we don't sell them.

Personally, I think the 89, 240 works about as good or better than some of our other family Volvos. BUT they [all Volvos] seem to have their own personality or idiosyncrasies or Achilles heels. I suggest trying to get yourself some original reviews of the particular car your are complaining about. I was surprised to read about some of the things that are just the way these cars are and there is nothing you can do do about it. For example, 740's are notorious for the front rotors warping. so you need to exercise extra attention to stay on top of that problem. 240's have comfortable seating, are a little slower on stopping, could have better handling, are somewhat noisy, can idle rough when cold (remember the O2 Sensor is not working until the temp gets up there much longer in the winter, so, the engine is in a default mode).

In other words, although I might test the cpu inputs, the cpu is one of the last things I would expect. The 89 has a great EZK-116 ign system. Much improved over the previous cars. I think the 89 is a classic. There are not too many of them in the yards. THAT says something. We have far more problems with our 1990, 240 sedan, with similar mileage (but then again, it was not maintained by the former owners, which explains that).

-- Bruce, 2001 wagon (sister owns it - not sure of model); Mom's 95, 940; Mom's 91, 740; Nehpews 91, 740 turbo; My 1990 series 2000-40 DLA; 1989 series 2000-45 DLA

Please refresh my memory. Are these computer problems also on the 700 series?
What are the typical symptoms of chip failure? Where can you buy replacement chips to swap out?

You can rebuild the 561 yourself by replacing the chip. very easy, takes about 10 minuits.cost about $70 + about $15 for anti-static strap and chip puller.
According to local dealer, the Original chip is the weak link , and the replacement is more reliable and upgrades to latest emission control and fuel effeciency standards, also better cold start

The original 561 is a problem. The 951 might be better but is also known to fail. Now there are a lot of 561 rebuilds in cars and "Testad" or other rebuild notation on them There is a rebuilt in a black plastic housing. I assume these are better. The ECUs go for $100-150, market rate. I suggest having one if you come accross a deal, even if you do not need it now. Also, a spare 016 AMM just so you can easily diagnose future trouble and avoid costly repairs.